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[syntax-errors] Positional-only parameters before Python 3.8 (#16481)

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Summary
--

Detect positional-only parameters before Python 3.8, as marked by the
`/` separator in a parameter list.

Test Plan
--
Inline tests.
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Brent Westbrook 2025-03-05 08:46:43 -05:00 • committed by GitHub
parent 23fd4927ae
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291
crates/ruff_python_parser/tests/snapshots/invalid_syntax@pos_only_py37.py.snap Normal file
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@ -0,0 +1,291 @@
---
source: crates/ruff_python_parser/tests/fixtures.rs
input_file: crates/ruff_python_parser/resources/inline/err/pos_only_py37.py
---
## AST
```
Module(
ModModule {
range: 0..136,
body: [
FunctionDef(
StmtFunctionDef {
range: 43..61,
is_async: false,
decorator_list: [],
name: Identifier {
id: Name("foo"),
range: 47..50,
},
type_params: None,
parameters: Parameters {
range: 50..56,
posonlyargs: [
ParameterWithDefault {
range: 51..52,
parameter: Parameter {
range: 51..52,
name: Identifier {
id: Name("a"),
range: 51..52,
},
annotation: None,
},
default: None,
},
],
args: [],
vararg: None,
kwonlyargs: [],
kwarg: None,
},
returns: None,
body: [
Expr(
StmtExpr {
range: 58..61,
value: EllipsisLiteral(
ExprEllipsisLiteral {
range: 58..61,
},
),
},
),
],
},
),
FunctionDef(
StmtFunctionDef {
range: 62..86,
is_async: false,
decorator_list: [],
name: Identifier {
id: Name("foo"),
range: 66..69,
},
type_params: None,
parameters: Parameters {
range: 69..81,
posonlyargs: [
ParameterWithDefault {
range: 70..71,
parameter: Parameter {
range: 70..71,
name: Identifier {
id: Name("a"),
range: 70..71,
},
annotation: None,
},
default: None,
},
],
args: [
ParameterWithDefault {
range: 76..77,
parameter: Parameter {
range: 76..77,
name: Identifier {
id: Name("b"),
range: 76..77,
},
annotation: None,
},
default: None,
},
],
vararg: None,
kwonlyargs: [],
kwarg: None,
},
returns: None,
body: [
Expr(
StmtExpr {
range: 83..86,
value: EllipsisLiteral(
ExprEllipsisLiteral {
range: 83..86,
},
),
},
),
],
},
),
FunctionDef(
StmtFunctionDef {
range: 87..115,
is_async: false,
decorator_list: [],
name: Identifier {
id: Name("foo"),
range: 91..94,
},
type_params: None,
parameters: Parameters {
range: 94..110,
posonlyargs: [
ParameterWithDefault {
range: 95..96,
parameter: Parameter {
range: 95..96,
name: Identifier {
id: Name("a"),
range: 95..96,
},
annotation: None,
},
default: None,
},
],
args: [],
vararg: Some(
Parameter {
range: 98..103,
name: Identifier {
id: Name("args"),
range: 99..103,
},
annotation: None,
},
),
kwonlyargs: [
ParameterWithDefault {
range: 108..109,
parameter: Parameter {
range: 108..109,
name: Identifier {
id: Name("b"),
range: 108..109,
},
annotation: None,
},
default: None,
},
],
kwarg: None,
},
returns: None,
body: [
Expr(
StmtExpr {
range: 112..115,
value: EllipsisLiteral(
ExprEllipsisLiteral {
range: 112..115,
},
),
},
),
],
},
),
FunctionDef(
StmtFunctionDef {
range: 116..135,
is_async: false,
decorator_list: [],
name: Identifier {
id: Name("foo"),
range: 120..123,
},
type_params: None,
parameters: Parameters {
range: 123..130,
posonlyargs: [],
args: [
ParameterWithDefault {
range: 124..125,
parameter: Parameter {
range: 124..125,
name: Identifier {
id: Name("a"),
range: 124..125,
},
annotation: None,
},
default: None,
},
],
vararg: None,
kwonlyargs: [],
kwarg: None,
},
returns: None,
body: [
Expr(
StmtExpr {
range: 132..135,
value: EllipsisLiteral(
ExprEllipsisLiteral {
range: 132..135,
},
),
},
),
],
},
),
],
},
)
```
## Errors
|
1 | # parse_options: {"target-version": "3.7"}
2 | def foo(a, /): ...
3 | def foo(a, /, b, /): ...
| ^ Syntax Error: Only one '/' separator allowed
4 | def foo(a, *args, /, b): ...
5 | def foo(a, //): ...
|
|
2 | def foo(a, /): ...
3 | def foo(a, /, b, /): ...
4 | def foo(a, *args, /, b): ...
| ^ Syntax Error: '/' parameter must appear before '*' parameter
5 | def foo(a, //): ...
|
|
3 | def foo(a, /, b, /): ...
4 | def foo(a, *args, /, b): ...
5 | def foo(a, //): ...
| ^^ Syntax Error: Expected ',', found '//'
|
## Unsupported Syntax Errors
|
1 | # parse_options: {"target-version": "3.7"}
2 | def foo(a, /): ...
| ^ Syntax Error: Cannot use positional-only parameter separator on Python 3.7 (syntax was added in Python 3.8)
3 | def foo(a, /, b, /): ...
4 | def foo(a, *args, /, b): ...
|
|
1 | # parse_options: {"target-version": "3.7"}
2 | def foo(a, /): ...
3 | def foo(a, /, b, /): ...
| ^ Syntax Error: Cannot use positional-only parameter separator on Python 3.7 (syntax was added in Python 3.8)
4 | def foo(a, *args, /, b): ...
5 | def foo(a, //): ...
|
|
2 | def foo(a, /): ...
3 | def foo(a, /, b, /): ...
4 | def foo(a, *args, /, b): ...
| ^ Syntax Error: Cannot use positional-only parameter separator on Python 3.7 (syntax was added in Python 3.8)
5 | def foo(a, //): ...
|

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@ -0,0 +1,61 @@
---
source: crates/ruff_python_parser/tests/fixtures.rs
input_file: crates/ruff_python_parser/resources/inline/ok/pos_only_py38.py
---
## AST
```
Module(
ModModule {
range: 0..62,
body: [
FunctionDef(
StmtFunctionDef {
range: 43..61,
is_async: false,
decorator_list: [],
name: Identifier {
id: Name("foo"),
range: 47..50,
},
type_params: None,
parameters: Parameters {
range: 50..56,
posonlyargs: [
ParameterWithDefault {
range: 51..52,
parameter: Parameter {
range: 51..52,
name: Identifier {
id: Name("a"),
range: 51..52,
},
annotation: None,
},
default: None,
},
],
args: [],
vararg: None,
kwonlyargs: [],
kwarg: None,
},
returns: None,
body: [
Expr(
StmtExpr {
range: 58..61,
value: EllipsisLiteral(
ExprEllipsisLiteral {
range: 58..61,
},
),
},
),
],
},
),
],
},
)
```